The causes of black teeth include simple pigmentation, staining of fillings, alveolar bone resorption, dental caries, etc. Depending on the cause of the disease, you can take scaling, sandblasting, removing fillings, dental scaling, surgery, etc. for treatment. 1. Simple pigmentation: People who often drink tea or smoke will have pigment deposited in the crevices of their teeth, and the crevices of their teeth will easily turn black if they are not cleaned for a long time. In this case, teeth can be whitened by scaling or sandblasting, but quitting smoking and drinking less tea are fundamental. 2. Staining of fillings: when fillings such as amalgam and resin are used on the adjacent surfaces of the teeth, if they are not polished, it is easy to adsorb foreign pigments and make the teeth black. In this case, you should seek medical attention to remove the blackened fillings and have them retreated. 3. Alveolar bone resorption: Tartar or periodontitis causes the alveolar bone to resorb, exposing the dark-colored root surface of the tooth and appearing as a black triangle. In this case, dental scaling should be performed to remove tartar, and medication etc. should be used to eliminate inflammation. 4. Dental caries: If the gap between the neighboring surfaces of the teeth is often stuffed with food, the formation of dental caries over time will lead to the blackening of the tooth gap. This condition can be treated by removing the decayed material and doing restorative surgery. There may also be other reasons for black teeth, such as orthodontics can also lead to black teeth. It is recommended to go to the hospital in a timely manner to improve the examination, to clarify the cause of the disease and then targeted treatment.